Re: [XenPPC] [PATCH/RFC] Schedule idle domain on secondary processors

[Hollis Blanchard <hollisb@xxxxxxxxxx>]

On Tue, 2006-08-29 at 09:02 +0200, Segher Boessenkool wrote:
> > It is quite stable in that the secondary processors reliably join the
> > idle domain and wait for free pages to scrub, handling 0x980  
> > interrupts with no problem.
> 
> What's this 980 exception?

Hypervisor decrementer. It's a good thing. ;)

> > However, the domU's sometimes hang during initialization.  When the  
> > domU hangs, it seems the whole machine freezes, including the serial  
> > console.
> 
> Most common cause of this is hanging the U3/U4.  Do you have a hardware
> debugger to see where this happens?

It's been my experience that RISCWatch isn't very helpful in these
situations (e.g. can't stop the processor). When the northbridge goes,
JTAG becomes unhappy.

-- 
Hollis Blanchard
IBM Linux Technology Center


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